1. Front:1) 2 * 4 = 8cm2) 3 * 3 = 9cm2 3) 2 * 2.5 = 5cm2.

2. Right:1) 2 * 3 = 6cm2) 2 * 3 = 6cm2 3) 2.5 * 2 = 5cm2.

3. Above:1) 4 * 3 =12cm2) 2 * 3 = 6cm2 3) 2 * 2 = 4cm2.

The second question:

The first, second and third can be put together to form a cube.

Question 3: (50*40+40*78+50*78)*2

=(2000+3 120+3900)*2

=9020*2

= 18040 cm2 A: -。

Question 4: 46*46*6

=2 1 16*6

= 12696 cm2 A: -。

The fifth question:

( 10* 12+6* 12)*2

=( 120+72)*2

=384 square centimeters A:-.

The sixth question:

(59.5*80+42.5*80)*2+59.5*42.5

= 16320+2528.75

=18848.75m2 =1.884875m2.

1.884875 * 1000 = 1884.875 m2 A:-。

Question 7:

50/2 = 25 cm

(50*2.5+2.5*2)*2

= 130*2

=260 square meters

260+50*25

=260+ 1250

= 15 10 m2 answer-.

Question 8:

8*6+(8*3+6*3)*2

=48+84

= 132 m2

132-11.4 =120.6 m2

120.6*4=482.4 yuan answer-

Question 9

Yellow (40*55+65*40+40*40)*2

= 12800 cm2

Red 40*55*2

=4400 square centimeters

40*40*2

=3200 square centimeters

40* 10*2

=800 square centimeters

40*40= 1600 cm2

4400+ 1600+3200+800

= 10000 cm2 Answer-

Question 10

Cut according to the edge of 8 cm

inequality

Question 1 1:

1) 1 block

2)6 pieces

3) 12 yuan

4)8 yuan